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Supplemental Guarantor Condensed Consolidating Statements of Cash Flows (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Cash, cash equivalents and restricted cash $ 355.7 $ 490.6 $ 376.8 $ 481.2
Net cash provided by (used in) operating activities 289.4 213.2    
Investing activities        
Purchases of property, plant and equipment (273.0) (138.6)    
Proceeds from sale of property, plant and equipment 0.9 1.5    
Purchase buyouts of leased equipment (0.5) (8.4)    
Acquisition of business, net of cash acquired (1.3) (895.5)    
Intercompany Activity - Investing 0.0      
Proceeds from sale of business, net 47.1 5.9    
Net cash used in investing activities (226.8) (1,035.1)    
Financing activities        
Net debt activity (66.8) 920.4    
Debt issuance costs (6.8) (90.5)    
Employee stock option exercises 0.0 0.9    
Purchase of treasury stock (3.6) (6.9)    
Purchase of noncontrolling interest (2.2) 0.0    
Intercompany Activity - Financing 0.0 0.0    
Net cash provided by (used in) financing activities (79.4) 823.9    
Effect of exchange rate changes on cash (4.3) 7.4    
Net increase (decrease) in cash, cash equivalents and restricted cash (21.1) 9.4    
Holdings [Member]        
Cash, cash equivalents and restricted cash 0.0 0.0 0.0 0.0
Net cash provided by (used in) operating activities 0.0 0.0    
Investing activities        
Purchases of property, plant and equipment 0.0 0.0    
Proceeds from sale of property, plant and equipment 0.0 0.0    
Purchase buyouts of leased equipment 0.0 0.0    
Acquisition of business, net of cash acquired 0.0 0.0    
Intercompany Activity - Investing 0.0      
Proceeds from sale of business, net 0.0 0.0    
Net cash used in investing activities 0.0 0.0    
Financing activities        
Net debt activity 0.0 0.0    
Debt issuance costs 0.0 0.0    
Employee stock option exercises   0.0    
Purchase of treasury stock (3.6) (6.9)    
Purchase of noncontrolling interest 0.0      
Intercompany Activity - Financing 3.6 6.9    
Net cash provided by (used in) financing activities 0.0 0.0    
Effect of exchange rate changes on cash 0.0 0.0    
Net increase (decrease) in cash, cash equivalents and restricted cash 0.0 0.0    
AAM Inc. [Member]        
Cash, cash equivalents and restricted cash 82.3 159.5 91.9 84.3
Net cash provided by (used in) operating activities 152.3 222.8    
Investing activities        
Purchases of property, plant and equipment (40.3) (28.4)    
Proceeds from sale of property, plant and equipment 0.0 0.3    
Purchase buyouts of leased equipment 0.0 (8.4)    
Acquisition of business, net of cash acquired 0.0 (953.5)    
Intercompany Activity - Investing 0.0      
Proceeds from sale of business, net 0.0 7.5    
Net cash used in investing activities (40.3) (982.5)    
Financing activities        
Net debt activity (111.2) 931.4    
Debt issuance costs (6.8) (90.5)    
Employee stock option exercises   0.9    
Purchase of treasury stock 0.0 0.0    
Purchase of noncontrolling interest 0.0      
Intercompany Activity - Financing (3.6) (6.9)    
Net cash provided by (used in) financing activities (121.6) 834.9    
Effect of exchange rate changes on cash 0.0 0.0    
Net increase (decrease) in cash, cash equivalents and restricted cash (9.6) 75.2    
Guarantor Subsidiaries [Member]        
Cash, cash equivalents and restricted cash 2.8 0.1 0.1 1.6
Net cash provided by (used in) operating activities 8.6 (25.2)    
Investing activities        
Purchases of property, plant and equipment (74.5) (39.2)    
Proceeds from sale of property, plant and equipment 0.5 0.1    
Purchase buyouts of leased equipment (0.5) 0.0    
Acquisition of business, net of cash acquired 0.0 64.6    
Intercompany Activity - Investing 0.0      
Proceeds from sale of business, net 42.7 (1.6)    
Net cash used in investing activities (31.8) 23.9    
Financing activities        
Net debt activity (0.4) (0.2)    
Debt issuance costs 0.0 0.0    
Employee stock option exercises   0.0    
Purchase of treasury stock 0.0 0.0    
Purchase of noncontrolling interest (2.2)      
Intercompany Activity - Financing 28.5 0.0    
Net cash provided by (used in) financing activities 25.9 (0.2)    
Effect of exchange rate changes on cash 0.0 0.0    
Net increase (decrease) in cash, cash equivalents and restricted cash 2.7 (1.5)    
Non-Guarantor Subsidiaries [Member]        
Cash, cash equivalents and restricted cash 270.6 331.0 284.8 395.3
Net cash provided by (used in) operating activities 128.5 15.6    
Investing activities        
Purchases of property, plant and equipment (158.2) (71.0)    
Proceeds from sale of property, plant and equipment 0.4 1.1    
Purchase buyouts of leased equipment 0.0 0.0    
Acquisition of business, net of cash acquired (1.3) (6.6)    
Intercompany Activity - Investing 0.0      
Proceeds from sale of business, net 4.4 0.0    
Net cash used in investing activities (154.7) (76.5)    
Financing activities        
Net debt activity 44.8 (10.8)    
Debt issuance costs 0.0 0.0    
Employee stock option exercises   0.0    
Purchase of treasury stock 0.0 0.0    
Purchase of noncontrolling interest 0.0      
Intercompany Activity - Financing (28.5) 0.0    
Net cash provided by (used in) financing activities 16.3 (10.8)    
Effect of exchange rate changes on cash (4.3) 7.4    
Net increase (decrease) in cash, cash equivalents and restricted cash (14.2) (64.3)    
Consolidation, Eliminations [Member]        
Investing activities        
Purchase buyouts of leased equipment   0.0    
Acquisition of business, net of cash acquired   0.0    
Proceeds from sale of business, net   0.0    
Consolidation, Eliminations [Member]        
Cash, cash equivalents and restricted cash 0.0 0.0 $ 0.0 $ 0.0
Net cash provided by (used in) operating activities 0.0 0.0    
Investing activities        
Purchases of property, plant and equipment 0.0 0.0    
Proceeds from sale of property, plant and equipment 0.0 0.0    
Purchase buyouts of leased equipment 0.0      
Acquisition of business, net of cash acquired 0.0      
Intercompany Activity - Investing 0.0      
Proceeds from sale of business, net 0.0      
Net cash used in investing activities 0.0 0.0    
Financing activities        
Net debt activity 0.0 0.0    
Debt issuance costs 0.0 0.0    
Employee stock option exercises   0.0    
Purchase of treasury stock 0.0 0.0    
Purchase of noncontrolling interest 0.0      
Intercompany Activity - Financing 0.0 0.0    
Net cash provided by (used in) financing activities 0.0 0.0    
Effect of exchange rate changes on cash 0.0 0.0    
Net increase (decrease) in cash, cash equivalents and restricted cash $ 0.0 $ 0.0